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Self-Hosted Open Source Security Encryption Backup IT Tools Disaster Recovery Storage

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Last Updated: 07-22-2026 09:17 AM (UTC)

Duplicati

Encrypted, incremental, compressed backups on storage you already have - Amazon S3, Backblaze B2, Google Drive, Azure, OneDrive, Dropbox, MEGA, Storj, WebDAV, SFTP, FTP, SMB, or a plain local disk - is what the MIT-licensed Duplicati has quietly done for years. Its security model is Trust No One: every block is encrypted with AES-256 (or a local GPG instance) before leaving the machine, and the passphrase never travels, so the storage provider holds only ciphertext. The block-based storage engine gives the best of both backup worlds: after one initial full backup, only changed data blocks upload - modify a tiny part of a huge file and only that part transfers - yet every backup version restores like a full backup in a single operation, with no incremental chains to replay. Deduplication and compression keep remote storage growth slow even across years of versions. A web interface manages everything: the built-in scheduler keeps backups current automatically, flexible filters select folders, file types, or custom patterns, retention policies prune old versions, and an integrated updater flags new releases. On compatible object-lock backends, immutable (WORM) storage protects backup data from ransomware that reaches the credentials. Runs on Windows, macOS, and Linux, free even for commercial use.

Duplicati

Benefits

  • The Cloud Never Sees Your Data
  • AES-256 encryption happens locally and the key never leaves your machine - the TNO principle means a provider breach exposes nothing.
  • Big Files, Tiny Uploads
  • Block-level incremental backups upload only changed chunks, so daily backups of large files cost megabytes, not gigabytes.
  • Every Version Restores Like a Full
  • No incremental chains to replay - any point in history restores in one operation despite incremental storage efficiency.
  • Your Storage, Your Rules
  • S3, B2, Drive, Azure, SFTP, or the NAS in the closet - Duplicati backs up to whatever you already pay for or own.

Features

  • AES-256 or GPG Encryption
  • All data encrypted client-side before transfer; the passphrase never leaves your machine.
  • Block-Based Incrementals
  • Deduplicated, compressed chunks mean only changed data uploads after the first backup.
  • Dozens of Destinations
  • S3, B2, Google Drive/Cloud, Azure, OneDrive, Dropbox, MEGA, Storj, WebDAV, SFTP, FTP, and local paths.
  • Scheduler and Retention
  • Automatic recurring backups with configurable version pruning policies.
  • Flexible Selection
  • Back up folders, specific file types, or custom filter patterns.
  • Ransomware Resistance
  • Immutable WORM storage via object locking on compatible backends.